Arthur cameron



(No Model.) 2 Sheets-Sheet 1.

A. CAMERON.

GRINDING MILL. No. 443,485. Patented Dec. '23, 1890.

maaaa 2- Sheets-Sheet 2.

(No Model.)

A. CAMERON. GRINDING MILL.

No. 443,485. Patented Dec. 23, 1890.

I UNITED STATES PATENT OFFICE.

ARTHUR CAMERON, OF CHICAGO, ILLINOIS, ASSIGNOR TC FREDERICK C. AUSTIN.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 443,485, dated December 23, 1890.

Application filed January 4, 1889. Serial No, 295,249. (No model.)

T0 all whom it may concern;

Be it .known that I, ARTHUR CAMERON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illigrinding-disk, but also as a carrier for a flanged or ribbed conveyer employed for 'feeding the material to the grinding-faces of the two burrs or disks. The said rotary shaft .is usually provided with a belt-pulley for a driving-belt, whereby the mill when set up near some suitable source of power can be conveniently driven therefrom by belting.

In such mills it has also been found desirable to vary the distance between the opposing faces of the grinding-disks with reference to the character of the material that is to be ground and the required degree of fineness ,to which it should be reduced, and as a common way of varying such space the rotary shaft carrying the running disk has been -niit thesaidshaft to run freely and without *retardation' by reason of its adjusting device; to provide for a quick, positive, and easy adj ustment of the shaft in a direction to set the running disk up to the stationary disk; to avoid heating the adjusting device during the operation of the mill; to provide asimple and efficient construction of adjusting device which shall retain its set or adjustment regardless of the rotary motion of the shaft; to adjust the shaft true and accurately, and to provide certain novel and improved details, all serving to promote the general efficiency and serviceability of portable grinding-mills.

To the attainment of the foregoing and other useful ends my invention consists in matters hereinafter set forth, and particularly specified in the claim.

In the accompanying drawings, Figure 1 represents a section taken on avertical plane through a grinding-mill embodying my invention. The plane of said section is coincident with the aXis of the rotary shaft that carries the running grinding-disk, the conveyer, and the belt-pulley in said View. The said shaft, conveyer, and belt-pulley are,however, shown in elevation. Fig. 2 represents, on a somewhat larger scale, a portion of the mill in elevation. Fig. 3 represents in section a collar, which is secured upon the rotary shaft and recessed to receive a set of anti-friction balls. Fig. i is an end view of the collar of Fig. 3 and shows the set of balls arranged about the shaft, which is represented in cross-section. Fig. 5 is an end view of an adjustable screw collar or abutment hereinafter referred to.

In said drawings, A indicates the main frame of the mill; B, the hopper; C, the stationary grinding-disk, and D the rotary grinding-disk.

The grinding-disks are provided with removable grinding-faces and are arranged within a casing a, to which the stationary grinding-disk can be bolted or otherwise suitably secured. Said casing is provided at its rear side with a suitable passage, as at ct, through which the material that is to be ground may pass to the grinding-disks, and it is further provided with a suitable outletpassage a through which the ground material may be discharged.

The rotary grinding-disk is secured upon and arranged adjacent to one end of a horizontally-arranged rotary driving-shaft E,

which at its said end is provided with a spirally ribbed or bladed conveyer I and as a preferred construction of rotary grindingdisk it is formed by a circular plate (I, fixed upon shaft E and faced byan annular toothed or ribbed plate d, which is removably bolted to the plate-backing (I, so that while serving to face the same it can be detached therefrom and slipped over the conveyer when it becomes desirable either to renew or repair the grinding-surface that is formed by said annular plate d. The conveyor F extends through a central opening in the stationary grinding-disk and projects into a passage way or chamber a, that is formed within the casing a to receive the material from the hopper, whereby the material can be taken from the chamber or passage o by the conveyor and carried to the opposing grinding-faces of the grinding-disks.

The driving-shaft l is mounted in bearings a and on the main frame, and at one end desirably terminates within the chamber a, it being obvious that to extend the shaft through and beyond the wall a of said chamber would be entirely unnecessary and, furthermore, objectionable. The drivingshaft thus provided with a grinding-disk and conveyer at one end is at its opposite end provided with the belt-pulley G, to which a driv' ing-belt from any suitable motor may be ap plied. The bearings a and a for the driving-shaft are between the rotary grindingdisk and the belt-pulley and no obstruction whatever is offered to the application and removal of a belt to and from the belt-pulley.

The rotary driving'shaft is mounted in its allotted bearings so that it may be shifted endwise for the purpose of adjusting the rotary grinding-disk relatively to the stationary grinding-disk. The shaft-adjuster for effecting such end-thrust of the shaft is arranged between the bearings a and a, whereby, while it can be operated for its allotted purpose, it will not be in the way of the application and removal of the driving-belt to and from the belt-pulley.

The driving-shaft is at a point substantially midway of its length provided with a fly or balance wheel H, and the device for shifting or adjusting the shaft is preferably arranged between the bearing a and said balancewhecl. As a means for thus shifting the driving-shaft so as to adjust the rotar grindingdisk, the bearing a is prolonged toward the rotary grinding-disk, as at a which said prolongation of the bearingis externally threaded, so as to provide a threaded bearing for an internally-threaded collar or not I.

The nut or collar I is titted upon the threaded bcarin g a so that it can be turned thereon, and thereby adjusted along the same. A collar K is pinned or keyed upon the rotary driving-shaft and provided at one end with an annular groove or recess 7:, which in effect enlarges the bore of said collar at one end of such bore. The annular recess 7r reeeives portions of anti-friction balls L, which are arranged in annular series around the rotarydriving-shaft and received to such extent within the shoulder or collar K thatportions of the balls shall project beyond the end of the collar shown in Fig. 3. Between the set of balls L and the nut or adjustable collar I, I arrange loosely upon the drivingshaft a collar or washer M, which by properly adjusting the nut I can be forced against the anti-friction balls.

The nut I and the washer M, regarded as an entirety, form an adjustable abutment which can be forced against the balls, whereby the thrust transmitted through the balls will be taken by the shoulder K, that is fixed upon the driving-shaft. In this way, by adjusting the nut I toward the grinding-disks the driving-shaft will be shifted endwise, and hence effect the adjustment of the rotar Y grinding-disk. I find that without the anti friction balls the adjusting device becomes unduly heated, owing to friction and'the high rate of speed at which the shaft is driven; but by employing such balls the parts will be kept as cool as may be desired.

The nut I can be locked by various locking devices; but as a preferred means it is provided with a notched flange 1', which can be engaged by a spring arm or finger 11 that is secured on the bearing a.

The casing a is removably bolted or otherwise removably attached to the main frame at one side of the latter, whereby when it becomes desirable to either renew or repair the grinding-surfaces of the burrs or grindingdisks the casing to can be first detached from the main frame, after which the grinding-disk G can be detached from the casing and the annular grinding-face (l of the disk D detached from the backing (l and moved forward and over the conveyer F, so as to clear the same. The general relative arrangement of the removable easing, grindingdisks, belt-pulley, and shaft-shifting device permits said removal of the casing and of the grind tug-disks without taking apart or disturbing the shaft-shifting device, and, as hereinbefore set forth, the arrangement of the shaft-adjusting device and belt-pulley permits the shaft to be readily belted at one end and allows the belt to be applied and removed without disturbingor taking apart any portion of the mill.

What I claim as my invention is- The herein described combination, sub stantially as set forth, in a grinding-mill, of a frame, a longitudinallyanovable rotary shaft mounted in bearings upon said frame and extending beyond each end thereof, a belt-pulley at. one end of said shaft, a rotar grindingdisl; rigidly secured to the other end portion of said shaft, a stationary grinding disk mounted upon said frame in front of said rotary disk, said stationary disk having an opening therethrough for the passage of the material, a removable easing secured to said ICC frame and inelosing' both of said disks, a ribbed conveyer carried by said shaft extending from the front face of the rotary disk through the opening in the stationary disk into said casing, one of said bearings supporting the shaft being externally screwthreaded, a nut I upon said bearing, awashei' M, loose upon said shaft, against which said nut abuts, a shoulder upon said shaft, and a set of anti-friction balls located between said to Washer and shoulder, said parts being constructed and organized as set forth.

ARTHUR CAMERON. Witnesses:

CHAS. G. PAGE, E. S. HEAD. 

